<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
</head>
<body>
    <!-- 使用async关键字，那么函数的返回值就是有一个promise -->
    <script>
        async function go(){
            return 10;
        }
        console.log('go();: ', go());
    </script>
</body>
</html>